package com.itheima.edu.info.manager.controller;

import com.itheima.edu.info.manager.dao.StudentDao;
import com.itheima.edu.info.manager.domain.Student;
import com.itheima.edu.info.manager.service.StudentService;

import java.util.Scanner;

public class StudentController {
    private StudentService studentService = new StudentService();
    private Scanner sc = new Scanner(System.in);

    //开启学生管理系统
    public void start() {
        Scanner sc = new Scanner(System.in);
        studentLoop:
        while (true) {
            //菜单搭建
            System.out.println("-------欢迎来到<学生>管理系统------");
            System.out.println("请输入您的选择: 1. 添加学生 2. 删除学生 3.修改学生 4.查看学生 5.退出");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    //System.out.println("添加");
                    addStudent();
                    break;
                case "2":
                    //System.out.println("删除");
                    deleteStudentById();
                    break;
                case "3":
                    // System.out.println("修改");
                    updateStudent();
                    break;
                case "4":
                    // System.out.println("查询");
                    findAllStudent();
                    break;
                case "5":
                    System.out.println("感谢您使用学生管理系统,再见!");
                    break studentLoop;
                default:
                    System.out.println("您的输入有误,请重新输入");
                    break;
            }
        }
    }

    //根据id修改学生
    public void updateStudent() {
        String updateId=  inputStudentId();
        Student newStu=inputStudentInfo(updateId);

        //让StudentService让他进行修改
        StudentService.updateStudent(updateId, newStu);
        System.out.println("修改成功!");
    }

    //根据id删除学生
    public void deleteStudentById() {
        String delId=  inputStudentId();
        //调用业务员的deleteStudentById根据id,删除学生
        StudentService.deleteStudentById(delId);
        //提示删除成功
        System.out.println("删除成功");
    }

    //查询学生
    public void findAllStudent() {
        //调用业务员中的获取发方法,得到学生的对象数组
        Student[] stus = studentService.findAllStudent();
        //判断数组中的内存地址,是否为null
        if (stus == null) {
            System.out.println("查无信息请添加后重试");
            return;
        }
        //遍历数组,获取学生信息并打印在控制台
        System.out.println("学号\t\t姓名\t年龄\t生日");
        for (int i = 0; i < stus.length; i++) {
            Student stu = stus[i];
            if (stu != null) {
                System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "\t\t" + stu.getBirthday());
            }
        }
    }

    //添加学生
    public void addStudent() {
        //StudentService studentService= new StudentService();
        String id;
        while (true) {
            System.out.println("请输入学生id");
            id = sc.next();
            boolean flag = studentService.isEsists(id, new StudentDao());
            if (flag) {
                System.out.println("学号已被占用,请重新输入");
            } else {
                break;
            }
        }
        Student stu=inputStudentInfo(id);
        //将学生对象传递给Service层(业务员)中的addStudent方法
        boolean result = studentService.addStudent(stu);
        if (result) {
            System.out.println("添加成功");
        } else {
            System.out.println("添加失败");
        }
    }
    //键盘录入学生id
    public String inputStudentId() {
        String id;
        while (true) {
            System.out.println("请输入学生id");
            id = sc.next();
            boolean flag = studentService.isEsists(id, new StudentDao());
            if (flag) {
                System.out.println("学号已被占用,请重新输入");
            } else {
                break;
            }
        }
        return id;
    }

    public Student inputStudentInfo(String id) {
        System.out.println("请输入学生姓名");
        String name = sc.next();
        System.out.println("请输入学生年龄");
        String age = sc.next();
        System.out.println("请输入学生生日");
        String birthday = sc.next();
        //将学生封装成学生对象
        Student stu = new Student();
        stu.setId(id);
        stu.setName(name);
        stu.setAge(age);
        stu.setBirthday(birthday);
        return stu;
    }
}
